Internet Engineering Task Force (IETF) S. Venaas
Request for Comments: 6676 R. Parekh
Category: Informational G. Van de Velde
ISSN: 2070-1721 Cisco Systems
T. Chown
University of Southampton
M. Eubanks
Iformata Communications
August 2012
Multicast Addresses for Documentation
Abstract
This document discusses which multicast addresses should be used for
documentation purposes and reserves multicast addresses for such use.
Some multicast addresses are derived from AS numbers or unicast
addresses. This document also explains how these can be used for
documentation purposes.
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for informational purposes.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Not all documents
approved by the IESG are a candidate for any level of Internet
Standard; see Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc6676.
Venaas, et al. Informational [Page 1]RFC 6676 Multicast Addresses for Documentation August 2012Copyright Notice
Copyright (c) 2012 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
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described in the Simplified BSD License.
Table of Contents
1. Introduction ....................................................2
2. IPv4 Multicast Documentation Addresses ..........................3
2.1. Administratively Scoped IPv4 Multicast Addresses ...........3
2.2. GLOP Multicast Addresses ...................................3
2.3. Unicast Prefix-Based IPv4 Multicast Addresses ..............4
3. IPv6 Multicast Documentation Addresses ..........................4
3.1. Unicast Prefix-Based IPv6 Multicast Addresses ..............5
3.2. Embedded-RP IPv6 Multicast Addresses .......................5
4. Security Considerations .........................................5
5. IANA Considerations .............................................5
6. Acknowledgments .................................................6
7. Informative References ..........................................6
1. Introduction
It is often useful in documentation, IETF documents, etc., to provide
examples containing IP multicast addresses. For documentation where
examples of general purpose multicast addresses are needed, one
should use multicast addresses that will never be assigned or in
actual use. There is a risk that addresses used in examples may
accidentally be used. It is then important that the same addresses
not be used by other multicast applications or services. It may also
be beneficial to filter out such addresses from multicast signalling
and to filter out multicast data sent to such addresses.
For unicast, there are both IPv4 and IPv6 addresses reserved for this
purpose; see [RFC5737] and [RFC3849], respectively. This document
reserves multicast addresses for this same purpose.
Venaas, et al. Informational [Page 2]RFC 6676 Multicast Addresses for Documentation August 2012
There are also some multicast addresses that are derived from AS
numbers or unicast addresses. For examples where such addresses are
desired, one should derive them from the AS numbers and unicast
addresses reserved for documentation purposes. This document also
discusses the use of these.
2. IPv4 Multicast Documentation Addresses
datatracker.ietf.org